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1. A method of marketing a product, involving paid promoters mixing anonymously with the target audience and endorsing the product
   "The demand for roaching - or whisper marketing - has increased over the past few years as businesses look for innovative ways to sell their products to a younger generation of savvy consumers"

1. Comb (hair) into a roach
    
2. Cut the mane off (a horse)

Type of: chop off, comb, cut off, lop off

Encyclopedia: Roach, Paul